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Title: An evaluation of the Larson-Doi model for liquid crystalline polymers using recoil
Authors: Vermant, Jan ×
Mortier, Marianne
Moldenaers, Paula
Mewis, Joannes #
Issue Date: Dec-1999
Publisher: Springer verlag
Series Title: Rheologica acta vol:38 issue:6 pages:537-547
Abstract: The mesoscopic models for the rheological properties of liquid crystalline polymers proposed by Larson and Doi in 1991 and Kawaguchi and Denn in 1999 are based on phenomenological expressions that describe the evolution of the defect density and the contribution of the "texture" to the stress. In the present work, we attempt to assess some of these assumptions by monitoring how the energy stored in the texture of liquid crystalline materials evolves during shear flows. For that purpose, strain recovery is measured as a function of the applied strain for flow reversal and intermittent flow. Solutions of poly-benzylglutamate in nz-cresol, hydroxypropylcellulose in water and a nematic surfactant solution are used as model systems. Although the behaviour is described qualitatively by the model, discrepancies between the predictions and the experiments are observed, especially when the shear history includes rest periods.
ISSN: 0035-4511
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter, Rheology and Technology Section
Chemical Engineering - miscellaneous
Clinical Residents Dentistry
× corresponding author
# (joint) last author

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